External Beam RT for Prostate Cancer - ASTRO
External Beam RT for Prostate Cancer - ASTRO
External Beam RT for Prostate Cancer - ASTRO
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Pros:<br />
Fiducial-based alignment<br />
– Less subjectivity<br />
– Good alignment<br />
– Allows target tracking<br />
– Better <strong>for</strong> large patients<br />
– Image fusion (e.g. MRI-<br />
CT)<br />
– Visualize rectal gas<br />
Cons:<br />
– Invasive<br />
– Daily<br />
– Fiducials may migrate<br />
– No oimage age of o SV, S , rectum/bladder<br />
ec u /b adde<br />
– No image of prostate surface<br />
contour<br />
– Shifts may not be representative of<br />
volume<br />
– Fiducial markers may not stay in<br />
prostate<br />
MDACC study comparing fiducials vs CT on rails:<br />
MDACC study comparing fiducials vs CT-on-rails:<br />
1=U/S guidance, 2 (base-apex)=90%, 3=best<br />
(IJROBP 2009, 74)
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